UM0851 datasheet(48/245 Pages) STMICROELECTRONICS

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Communication device drivers

UM0851

48/245

Doc ID 16604 Rev 2

/*State the member functions as provided in the above structure as per your design

requirements.*/

GMAC interface to kernel

The key kernel interfaces that have been set up in the initialization routines are:

●

int (*open)(struct net_device *dev);

This is the function that opens the interface. The interface is opened whenever ifconfig

activates it. The open method registers any system resource it needs (I/O ports, IRQ,

DMA) and sets up the MAC hardware as well as the PHY in auto negotiation mode. The

open method also starts the interface transmit queue. The kernel provides a function to

start the queue:

void netif_start_queue(struct net_device *dev);

●

int (*stop)(struct net_device *dev);

This function stops the interface and powers down the PHY. This function should

reverse operations performed at open time.The close method also stops the interface's

transmit queue. The kernel provides a function to stop the queue:

void netif_stop_queue(struct net_device *dev);

●

int (*hard_start_xmit) (struct sk_buff *skb, struct net_device *dev);

Method called to initiate the transmission of a packet. The full packet (protocol headers

and all) is contained in a socket buffer (struct sk_buff) structure. The function basically

makes use of the chained DMA descriptors to transmit the packet sent by stack.

●

void (*tx_timeout)(struct net_device *dev);

Method called by the networking code when a packet transmission fails to complete

within a reasonable period, on the assumption that an interrupt has been missed or the

interface has locked up. It should handle the problem and resume packet transmission.

The current driver reinitializes the total DMA/MAC related hardware.

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int (*do_ioctl)(struct net_device *dev, struct ifreq *ifr, int cmd);

Function that performs interface-specific ioctl commands (the implementation of these

commands is described in the "Custom ioctl commands" section.) The corresponding

field in struct net_device can be left as NULL if the interface does not need any

interface-specific commands.

The SPEAr driver routes the ioctls to the standard MII interface provided by the kernel.

The commands are as follows:

SIOCGMIIPHY : get address of MII PHY in use

SIOCGMIIREG : read MII PHY register.

The usage of the above ioctls can be explored by using the <mii_tool> provided in the

user space.

●

int (*change_mtu)(struct net_device *dev, int new_mtu);

Function that takes action if there is a change in the maximum transfer unit (MTU) for

the interface.

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